package com.fz.song.util;

import java.io.UnsupportedEncodingException;


public class Base64Utils {
	
	
	 private static char[] base64EncodeChars = new char[]{
         'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
         'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
         'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
         'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
         'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
         'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
         'w', 'x', 'y', 'z', '0', '1', '2', '3',
         '4', '5', '6', '7', '8', '9', '+', '/'};
 private static byte[] base64DecodeChars = new byte[]{
         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
         52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
         -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
         15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
         -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
         41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1};

 public static String encode(byte[] data) {
     StringBuffer sb = new StringBuffer();
     int len = data.length;
     int i = 0;
     int b1, b2, b3;
     while (i < len) {
         b1 = data[i++] & 0xff;
         if (i == len) {
             sb.append(base64EncodeChars[b1 >>> 2]);
             sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
             sb.append("==");
             break;
         }
         b2 = data[i++] & 0xff;
         if (i == len) {
             sb.append(base64EncodeChars[b1 >>> 2]);
             sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
             sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
             sb.append("=");
             break;
         }
         b3 = data[i++] & 0xff;
         sb.append(base64EncodeChars[b1 >>> 2]);
         sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
         sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);
         sb.append(base64EncodeChars[b3 & 0x3f]);
     }
   
     return sb.toString();
 }

 public static byte[] decode(String str) throws UnsupportedEncodingException {
     StringBuffer sb = new StringBuffer();
     byte[] data = str.getBytes("US-ASCII");
     int len = data.length;
     int i = 0;
     int b1, b2, b3, b4;
     while (i < len) {
        
         do {
             b1 = base64DecodeChars[data[i++]];
         } while (i < len && b1 == -1);
         if (b1 == -1) break;
        
         do {
             b2 = base64DecodeChars
                     [data[i++]];
         } while (i < len && b2 == -1);
         if (b2 == -1) break;
         sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
        
         do {
             b3 = data[i++];
             if (b3 == 61) return sb.toString().getBytes("iso8859-1");
             b3 = base64DecodeChars[b3];
         } while (i < len && b3 == -1);
         if (b3 == -1) break;
         sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
        
         do {
             b4 = data[i++];
             if (b4 == 61) return sb.toString().getBytes("iso8859-1");
             b4 = base64DecodeChars[b4];
         } while (i < len && b4 == -1);
         if (b4 == -1) break;
         sb.append((char) (((b3 & 0x03) << 6) | b4));
     }
   
     return sb.toString().getBytes("iso8859-1");
 }
 public static void main(String[] args) {
	
	// PropertyConfigurator.configure("log4j.properties");
    System.out.println(Base64Utils.encode(("n0v3ll").getBytes()));
     try {
		System.out.println(new String(Base64Utils.decode("YWJkc2ZjMTIzNDU=")));
	} catch (UnsupportedEncodingException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
    
 }
}
